Screening machine



July 27, 1937.

' w. L. WETTLAUFER SCREENING MACHINE Filed Jan. ze, 1934 3 s fieets-sheet l1 wwf given-fag .zaly 27, 1937.

W. L. WETTLAUFER SCREENING MACHINE Filed Jan. 26. 1934 5 Sheets-Sheet 2 July 27, 1937.

W. L. WETTLAUFER SCREENING MACHINE Filed Jan. 26, -1954 s sheets-sheet s' Patented July 27, 1937 PATENT Aor'Fic-la` SCREENING MACHINE william L wealaufer, Buffalo, N. r., signor to The W. S. Tyler Company, Cleveland, Ohio, a

corporation of Ohio Application January 26, 1934, Serial No. 708,451

, 8 Claims. 'Ihis invention relates to certain new and useful improvements in vibrating apparatus or screening machines.

It has for one `of; its objects to provide an `5, eilcient and inexpensive machine of this character having simple and reliable means for effecting the vibration of the machine at a minimum expenditure of power.

Another object of the invention is to provide 10 a yieldably suspended screening machine -having individual vibration-producing units applied to the opposite sidesof the screen frame.

A further object of the machine is to provide means for connecting the screen clothing to the 15- machine frame in combination with means for eilt'ectually supporting or holding and exerting a' described and particularly pointed out in the appended claims. In the accompanying drawings:`A Figure 1 is a perspectiveviewof ascreening 30- machine embodying my invention. Figure 2 i's an enlarged fragmentary cross section taken in the plane of line 2-2, Figure 1. Figure 3-is a top plan view thereof. Figure 4 is a cross section taken on line 4 4, Figure 3. Figure 5 isa side 35 elevation of a suspension means for the machine. Figure 6 is an enlarged cross -section taken on line 6, Figure 5.. Figure 'I is across section of the screening machine showing a modication of the means for holding and stretching the screen cloth. Figure 8 is an enlarged fragmentary cross section thereof similar to Figure 2. Figure 9 is a detached perspective view of one of the end-guides for the screen cloth supporti ing rods. Y 4 Similar characters of reference indicate corresponding parts throughout the several views.

Referring now to the drawings, the screening machine comprises a frame suspended in any4 suitable manner for vibratory movement and 50 consisting of longitudinal side members I0, transverse end'members II, and screen clothing I2 of wire mesh or the like for separating or grading materials. This frame mj be yieldingly supported from the floor or from overhead through 55 the medium of cross beams I3 and coil springs through like openings 21 in the side members III 5 of individual vibration-producing units supported thereon at opposite sides thereof. Each of these umts preferably consists of an electric 10 motor I1 secured to suitable supports I8 project- 'ing laterally from the frame and having xed to the shaft I9 thereof an eccentrically disposed body or weight 20, the rotating movements of which produce vibrations which are transmitted to the screen frame and its screening surface I2. While two of these vibrating units. have been shown in the drawings disposed substantially centrally of the screen frame, it is to be understood that any number may be employed at different points along the frame depending on the size or capacity of the screening machine. In order to eiect a uniform distribution of the vibrating impulses over the entire screen deck I2, I provide vvibration-transmitting members 2| connecting the motor supports I8 with the frame 25 members I0, II. e

At opposite sides of thescreen frame are provided means for detachably securing the screen clothing I2 thereto and for drawing or stretching the same in a taut condition transversely of the frame. In its preferred construction shown in the drawings, these means `consist of relatively adjustable clamping members in the `form of its lower en d is free for displacement towardand from such side member to draw or release the tension on the screen clothing., .The companion outer plate 23 is disposed between the frame 45 side member and the inner plate 22 and is susi pended from the former by straps 25 or the likel I for movement with or relative to the plate 22.

Adjustment of'the4 plates toward the side mem-Y e bers I0 to stretch the screen clothing is accom- 50 plish'ed by any suitable means, that shown in the drawings, by way of example, consisting of bolts 26 passing through openings in said plates and Between its marginal edges the screen clothing.k

is supported on rods 30 disposed transversely of the frame I0, Il and so mounted as to be sprung to a bowed or upwardly arched position against the underside of the clothing to further stretch it and to camber it crosswise of the frame. These rods are preferably disposed in substantially parallel relation diagonally of the frame with one end of each rod being approximately opposite the other end of an adjoining rod` in the 'manner shown in Figure 3, whereby the screen clothing has a practically continuous transverse support from end to end of the frame. At their ends the rods 39 extend through corresponding alining openings 3| located in the side members Ill in a plane below the jaw portions of the screen-attaching plates 22, 23. The means for bowing each of the rods upwardly consist of adjusting bolts 32 mounted on brackets 33 secured to the outer faces of the side members I0 and bearing at. their lower ends against the top sides of the extended portions of the rods in the manner shown in Figure 2.` Upon screwing the bolts downwardly the rods are bowed upwardly intermediate their ends until the desired camber and tension on the screen clothing has been reached. If desired, the extended portions of the rods 30 may have sleeves 34 thereon which bear inwardly of the side members I0 on bearing members 35 secured to the latter. Furthermore, the

A screen-engaging portions ofthe rods may be provided with covers 36 of rubber orl like material to thereby provide a cushioned support for the screen clothin-g.

In Figure 5 I have shown an overhead suspension for the screen frame, wherein the latter is hung at its opposite sides from cables.31 or the 'like which are connected at their free ends to suspension springs 38 applied to the frame. Intermediate its ends, each cable passes over pulleys 39 mounted on an overhead support 49 andalso under a third pulley 4l connected to a suspension spring 42 rising substantially centrally from the screen frame. Either one or both of the pulleys 39 is adjustably iixed to the support 40, whereby the screen frame l0 may be set atany desired inclination. Bolts 43-serve to support and clamp the pulleys -39 against turning after a given adjustment has been made.

In 'the modified form of the invention shown in Figures 7, 8 and 9, the screen-clothing I2 is rendered taut vand cambered by means consisting A'oi' supportingrods 44 disposed generally transversely of the screen-frame and held at their ends against displacement lengthwise of the frame by substantially U-shaped clips or guides 45 secured to the inner faces of the side plates .46. Intermediate their ends these rods are supported on one' or more longitudinal Vfulcrum bars 41. Applied to thev inner faces of the side plates are screen-gripping,' angle plates 48, 49 which are adjustable laterally of thev screen-frame tov the rods 44 to exertY a downwardpressure thereon 7 and 8. For this purpose, the plates 48, 49 are suspended -from their upper ends on the side plates 46 so as to swing downwardly and outwardly, upright draw bars 50 engaging the inner plates 49 and serving through the medium of adjusting bolts 5I to move-said plates bodily outward from the position shown by dotted lines in Figure 8 to that shown by full lines in the same gf-gure to not only stretch the screen cloth and render it taut but at the same time give a camber to it crosswise of the frame.

I claim as my invention: l

1. A shaking screen, comprising a frame, a screening surface thereon, iiexible, self-supporting members beneath the screening surface, and means for bowing said members in engagement with said screening surface to stretch and camber the same.

2. A`shaking screen, comprising a frame, a screen deck thereon, flexible self-supporting members on said frame beneath the deck, and means engaging said members adjacent the ends thereof for bowing them upwardly against .the underside of said deck to camber it.

3. A shaking screen, comprising a frame having openings in its opposite sides, a screen deck thereon, supporting rods on said frame beneath the deck and extending through said frameopenings, and adjustable means mounted on said frame for exerting a pressure on the yextended ends of said rods for bowing them upwardly against the underside of said deck to stretch and camber it. e

4. A shaking screen, comprising a frame, a screen deck thereon, exible transverse selfsupporting members on said frame beneath said deck and disposed diagonally of said frame to support the deck transversely from end to en'd thereof, and means for bowing said exible supporting members upwardly to stretch and came ber the screen deck.

5. A shaking screen, comprising a frame including screen clothing, draw plates mounted on opposite sides of said frame and having means thereon for securing the corresponding marginal edges of the screen clothing thereto, means for adjusting said plates to stretch the screen clothing, flexible self-supporting members on said frame beneath said clothing, and means for flexing said members upwardly to further stretch and camber'the screen clothing.

6. A shaking screen, comprising a frame including screen clothing, draw plates mounted on opposite sides of said frame and having means thereon for securing the corresponding marginal edges of the screen clothing thereto, means for adjusting said plates to stretch the screen clothing, flexible self-supporting members mounted on said frame beneath said clothing, and adjustable means applied to the frame and engaging opposite ends of said members for exerting a pressure thereon to iex them upwardly against the underside of the screen clothing to further stretch and camber it. y

7. A shaking screen, comprising a frame including screenv clothing, draw plates mounted on opposite sides of said frame and-having means thereon for securing the corresponding marginal edges of the screen clothing thereto,'means for adjusting said plates to stretch the screen clothing, said frame having openings in its opposite sides, supporting rods disposed transversely of the frame and extending throughsaid openings, and adjustable means mounted on said frameA and engasinstheextendedendsofsaidrodsforbawmg 1I the rods upwardly against the underside of said clothing to further stretch and camber it.

8. A shaking` screen, comprising a frame including screen clothing, draw plates mounted for -swinging movement on opposite sides oi? said frame and having means thereon for securing the corresponding marginal edges of the screen clothing thereto, supporting rods disposed transversely of the frame and capable of being bowed up- 

